| Frederick to Oberkirch | 4,071.50 mi (6,552.45 km) |
| Frederick to Obernburg am Main | 4,074.99 mi (6,558.07 km) |
| Frederick to Obernkirchen | 4,002.65 mi (6,441.64 km) |
| Frederick to Oberschleissheim | 4,222.73 mi (6,795.83 km) |
| Frederick to Oberstdorf | 4,197.20 mi (6,754.75 km) |
| Frederick to Obertraubling | 4,223.60 mi (6,797.23 km) |
| Frederick to Obertshausen | 4,055.85 mi (6,527.27 km) |
| Frederick to Oberursel | 4,041.54 mi (6,504.24 km) |
| Frederick to Ochsenfurt | 4,117.86 mi (6,627.05 km) |
| Frederick to Ochsenhausen | 4,162.40 mi (6,698.73 km) |
| Frederick to Ochtrup | 3,929.81 mi (6,324.42 km) |
| Frederick to Odenthal | 3,959.44 mi (6,372.10 km) |
| Frederick to Oelde | 3,977.52 mi (6,401.20 km) |
| Frederick to Oelsnitz | 4,176.90 mi (6,722.07 km) |
| Frederick to Oer-Erkenschwick | 3,947.72 mi (6,353.23 km) |
